Electbobe



R. VAN SANDT AND w. T. WILLIAMS.

INSULATED ELECTRODE.

APPLICATION FILED nEc.29.1919.

L 2. 9.! 1T E 3w s Mm aw d2 m m D1 v INVENTOR.

( M ATgRh/EY.

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R. VAN SANDT AND W. T. WILLIAMS.

INSULATED ELECTRODE.

APPLICATION FILED 050.129.1919.

1,390,81 9. Patented Sept. 13,1921.

1-, Z 2 SHEETS-SHEET 2.

I N VEN TOR.

into the upper end of the glass tube with its flange 18 resting upon the top edge surface of said tube.

A metal plug 19 is then screwed into the upper end of the bore in thecasing as a closure for said vbore, with theterminal rod 12 of the electrode extending through a central bore therein and attached thereto by soldering or otherwiseto form a tightseal.

A lead wire 20 connects in the usual manner withthe terminal rod, as shown.

c This structure provides an insulated electrode which is of a-nature' which will withstand the stress incident to the transmission of hightension currentand to expansion and contraction of the component elements due primarily stated, the particular construction here shown and described is of course suseeptible of modification and the invention is not necessarily to be considered as limited in this regard. Y a

We claim:

1. An insulated electrode comprising aninsulating casing having a longitudinal bore,

and an electrode centrally supported within.

said bore and incased in concentric layers of different insulating materials.

2.- An insulated electrode comprising an insulating casing having a longitudinal bore, an electrode centrally supported within said bore, and a plurality of concentric layers of insulating material and intermediate layers of insulating wax between theelectrode and the walls of the bore. 7 V

3. An insulated electrodecomprising an 7 insulating casing having a longitudinal bore, an electrode centrally supportedwithin said bore, a mica tube surrounding the electrode,

a glass tube surrounding thelmica tube, and insulating wax binding the tubes and elecarticular advantage resides in.

positioned around the electrode, insulating wax binding the tubes and electrode together and the outer tube to the walls of said bore, and a closure for the opposite end of the bore contacting with the electrode.

5. An insulated electrode comprising an insulating casing having a longitudinal bore, a plug screw-threaded into one end of said bore, an electrode projecting outwardly from the plug, a terminal rod attached to the plug and centrally positioned within said bore, a'mica tube surrounding the rod, a glass tube surrounding the mica tube, and a closure for the opposite end of the casing bore.

6. An insulating electrode comprising an insulating casing having a longitudinal bore, a plug screw-threaded into the bottom end of said bore, an electrode supported by the plug and centrally positioned within the easing bore, a mica bushing seated on the plug and surrounding the electrode, a mica tube surrounding the electrode and seating on said bushing, a glass tube surrounding the mica tube and seating on the bushing, insulating wax maintaining the elements within the casing bore against movement, a second mica bushing surrounding the electrode and engaging the tops of the tubes, and a closure for the casing bore contacting with the electrode.

Signed at Los Angeles, California, this 20thvday of December, 1919.

I y RAY VAN SANDT.

lVILLIAM T. WILLIAMS.

\Vitnesses CLARENCE B. FOSTER, L. BELLE lVEAvER. 

